D28779: [Fstab] Use new style connect API

[Stefan Brüns]

bruns added a dependent revision: D28782: [Fstab] Do not emit deviceAdded twice 
on fstab/mtab changes.

REPOSITORY
  R245 Solid

REVISION DETAIL
  https://phabricator.kde.org/D28779

To: bruns, #frameworks
Cc: kde-frameworks-devel, LeGast00n, cblack, michaelh, ngraham, bruns